public static FunctionObject FunctionInitialize(FunctionObject f, FunctionCreateKind kind, FormalParameters parameters, FunctionStatementList body, LexicalEnvironment scope)
{
var len = parameters.ExpectedArgumentCount();
f.DefinePropertyOrThrow("length", new PropertyDescriptor(new NumberValue(len), false, false, true));
f.Environment = scope;
f.FormalParameters = parameters;
f.Code = body;
if (kind == FunctionCreateKind.Arrow)
{
f.ThisMode = ThisMode.Lexical;
}
else if (f.Strict)
{
f.ThisMode = ThisMode.Strict;
}
else
{
f.ThisMode = ThisMode.Global;
}
return(f);
}
private static Completion EvalDeclarationInstantiation(ScriptStatementList body, LexicalEnvironment varEnv, LexicalEnvironment lexEnv, bool strict)
{
var varNames = body.VarDeclaredNames();
var varDeclarations = body.VarScopedDeclarations();
var lexEnvRec = lexEnv.EnvironmentRecord;
var varEnvRec = varEnv.EnvironmentRecord;
if (!strict)
{
if (varEnvRec is GlobalEnvironmentRecord g)
{
foreach (var name in varNames)
{
if (g.HasLexicalDeclaration(name))
{
return(Completion.ThrowSyntaxError("Spec 18.2.1.3 step 5ai1"));
}
}
}
LexicalEnvironment?thisLex = lexEnv;
while (thisLex != varEnv)
{
var thisEnvRec = thisLex.EnvironmentRecord;
if (!(thisEnvRec is ObjectEnvironmentRecord))
{
foreach (var name in varNames)
{
if (thisEnvRec.HasBinding(name).Other)
{
return(Completion.ThrowSyntaxError("Spec 18.2.1.3 step 5dii2ai"));
}
}
}
thisLex = thisLex.Outer;
if (thisLex == null)
{
throw new InvalidOperationException("thisLex and varEnv never matched");
}
}
}
var functionsToInitialize = new List <FunctionDeclaration>();
var declaredFunctionNames = new List <string>();
foreach (var d in varDeclarations.Reverse())
{
if (!(d is VariableDeclaration) && !(d is ForBinding))
{
if (!(d is FunctionDeclaration f))
{
throw new InvalidOperationException("Spec 18.2.1.3 step 8ai");
}
var fn = f.BoundNames()[0];
if (!declaredFunctionNames.Contains(fn))
{
if (varEnvRec is GlobalEnvironmentRecord g)
{
var fnDefinable = g.CanDeclareGlobalFunction(fn);
if (fnDefinable.IsAbrupt())
{
return(fnDefinable);
}
if (!fnDefinable.Other)
{
return(Completion.ThrowTypeError($"Function {fn} is not definable in global scope"));
}
}
declaredFunctionNames.Add(fn);
functionsToInitialize.Insert(0, f);
}
}
}
var declaredVarNames = new List <string>();
foreach (var d in varDeclarations)
{
IReadOnlyList <string>?boundNames = null;
if (d is VariableDeclaration v)
{
boundNames = v.BoundNames();
}
if (d is ForBinding f)
{
boundNames = f.BoundNames();
}
if (boundNames != null)
{
foreach (var vn in boundNames)
{
if (!declaredFunctionNames.Contains(vn))
{
if (varEnvRec is GlobalEnvironmentRecord g)
{
var fnDefinable = g.CanDeclareGlobalVar(vn);
if (fnDefinable.IsAbrupt())
{
return(fnDefinable);
}
if (!fnDefinable.Other)
{
return(Completion.ThrowTypeError($"Variable {vn} is not definable in global scope"));
}
}
if (!declaredVarNames.Contains(vn))
{
declaredVarNames.Add(vn);
}
}
}
}
}
var lexDeclarations = body.LexicallyScopedDeclarations();
foreach (var d in lexDeclarations)
{
foreach (var dn in d.BoundNames())
{
Completion comp;
if (d.IsConstantDeclaration())
{
comp = lexEnvRec.CreateImmutableBinding(dn, true);
}
else
{
comp = lexEnvRec.CreateMutableBinding(dn, false);
}
if (comp.IsAbrupt())
{
return(comp);
}
}
}
foreach (var f in functionsToInitialize)
{
var fn = f.BoundNames()[0];
var fo = f.InstantiateFunctionObject(lexEnv);
if (varEnvRec is GlobalEnvironmentRecord g)
{
var comp = g.CreateGlobalFunctionBinding(fn, fo, true);
if (comp.IsAbrupt())
{
return(comp);
}
}
else
{
var bindingExists = varEnvRec.HasBinding(fn);
if (!bindingExists.Other)
{
var status = varEnvRec.CreateMutableBinding(fn, true);
if (status.IsAbrupt())
{
throw new InvalidOperationException("Spec 18.2.1.3 Step 15dii2");
}
varEnvRec.InitializeBinding(fn, fo);
}
else
{
varEnvRec.SetMutableBinding(fn, fo, false);
}
}
}
foreach (var vn in declaredVarNames)
{
if (varEnvRec is GlobalEnvironmentRecord g)
{
var comp = g.CreateGlobalVarBinding(vn, true);
if (comp.IsAbrupt())
{
return(comp);
}
}
else
{
var bindingExists = varEnvRec.HasBinding(vn);
if (!bindingExists.Other)
{
var status = varEnvRec.CreateMutableBinding(vn, true);
if (status.IsAbrupt())
{
throw new InvalidOperationException("Spec 18.2.1.3 Step 16bii2");
}
varEnvRec.InitializeBinding(vn, UndefinedValue.Instance);
}
}
}
return(Completion.NormalCompletion());
}
public static FunctionObject FunctionCreate(FunctionCreateKind kind, FormalParameters parameters, FunctionStatementList body, LexicalEnvironment scope, bool strict, IValue?prototype = null)
{
if (prototype == null)
{
prototype = Interpreter.Instance().CurrentRealm().Intrinsics.FunctionPrototype;
}
var functionKind = kind == FunctionCreateKind.Normal ? FunctionKind.Normal : FunctionKind.NonConstructor;
FunctionObject F = FunctionAllocate(prototype, strict, functionKind);
return(FunctionInitialize(F, kind, parameters, body, scope));
}